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    <title>variance</title>
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    <div align="right">Last update : July 2000</div>
    <p>
      <b>variance</b> -  variance of  the values of a  vector or matrix</p>
    <h3>
      <font color="blue">Calling Sequence</font>
    </h3>
    <dl>
      <dd>
        <tt>s=variance(x)  </tt>
      </dd>
      <dd>
        <tt>s=variance(x,'r') or m=variance(x,1)  </tt>
      </dd>
      <dd>
        <tt>s=variance(x,'c') or m=variance(x,2)  </tt>
      </dd>
    </dl>
    <h3>
      <font color="blue">Parameters</font>
    </h3>
    <ul>
      <li>
        <tt>
          <b>x</b>
        </tt>: real or complex vector or matrix</li>
    </ul>
    <h3>
      <font color="blue">Description</font>
    </h3>
    <p>
    This function  computes the variance of  the values of a
    vector or matrix <tt>
        <b>x</b>
      </tt>.</p>
    <p>
    For a vector or a matrix <tt>
        <b>x</b>
      </tt>, <tt>
        <b>s=variance(x)</b>
      </tt> returns
    in the scalar <tt>
        <b>s</b>
      </tt> the variance of all the entries of
    <tt>
        <b>x</b>
      </tt>.</p>
    <p>
      <tt>
        <b>s=variance(x,'r')</b>
      </tt> (or,  equivalently, <tt>
        <b>s=variance(x,1)</b>
      </tt>)
    is the rowwise variance. It returns in each entry of the
    row vector s the variance of each column of <tt>
        <b>x</b>
      </tt>.</p>
    <p>
      <tt>
        <b>s=variance(x,'c')</b>
      </tt> (or, equivalently,  <tt>
        <b>s=variance(x,2)</b>
      </tt>)
    is the columnwise  standard  deviation.  It returns   in
    each entry of the column vector  <tt>
        <b>s</b>
      </tt> the variance of
    each row of <tt>
        <b>x</b>
      </tt>.</p>
    <h3>
      <font color="blue">Examples</font>
    </h3>
    <pre>


x=[0.2113249 0.0002211 0.6653811;0.7560439 0.4453586 0.6283918]
s=variance(x)
s=variance(x,'r')
s=variance(x,'c')

 
  </pre>
    <h3>
      <font color="blue">Author</font>
    </h3>
    <p> Carlos Klimann</p>
    <h3>
      <font color="blue">Bibliography</font>
    </h3>
    <p>
    Wonacott, T.H. &amp; Wonacott, R.J.; Introductory Statistics, fifth edition, J.Wiley &amp; Sons, 1990.</p>
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